English scholar who produced a commentary on De sphaera by thirteenth-century English mathematician Sacrobosco. In Robertus's text, entitled Tractatus quadrantis vetus, he discussed a demonstration of the force of gravity using a millstone. Robertus also wrote Canons for the Astrolabe, later printed in 1478.
"Robertus Anglicus." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Encyclopedia.com. (September 25, 2018). http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/robertus-anglicus
"Robertus Anglicus." Science and Its Times: Understanding the Social Significance of Scientific Discovery. . Retrieved September 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/robertus-anglicus